Ski



March B. ULLEVQLDSAETER 2,112,183

SKI

Filed Sept. 22, 1936 /A -m hka I /v wen/210 Patented Mar. 22, 1938'UNITED STATES PATENT OFFICE Application September 22, 1936, Serial No.102,012 In Norway October 21, 1935 5 Claims. (Cl. 280-28) Skis arepreviously knownmade up of a single layer which consists of rails gluedtogether in the lateral direction of the ski. However, in order torealize a reliable interconnection between the rails, the same must besecured in relation to each other by means of through-going mechanicalsecuring means, in addition to the glue or cement made use of.

Further, skis are known, which are made up of two layers, viz. a toplayer consisting of rails glued together in the lateral direction of theski and a solid bottom layer or sole connected to the top layer and therails thereof.

Skis of this type have, however, the drawback that when the edges of therunning face of the skis have become worn, the skis must either becondemned or the entire bottom layer or sole must be renewed, whichdemands time and costs, since a common planing of the running face ofthe ski is not possible in practice in view of the relative thinness ofthe sole. It is also diflicult to provide the ski with such edgeprotectors as are now common since the securing screws for suchprotectors would have to be screwed either into the dividing linebetween the two layers or into the top layer, which is made of lighterand softer material, and thus would not be reliably secured.

Further the bottom or sole layer, which is a layer extending over theentire width and length of the ski, has a tendency to warp and therebyto act upon the top layer, so that the entire ski becomes warped.

It is the object of the present invention to pro vide a ski in whichsaid drawbacks are eliminated, and a chief feature of the inventionresides therein, that the ski is made up of a bottom layer consisting ofrails which are glued together in the lateral direction of the ski andhaving secured thereon one or more layers.

In this arrangement the bottom layer may be given such a thickness thatit is possible, when the edges of the running face have become worn,repeatedly to plane said face in usual manner, and further it ispossible to provide the side parts of the ski, if desired, with edgeprotectors, the securing screws of which are screwed into solid, hardmaterial. Still further it is possible to make the outermost rails ofthe bottom layer, or the lowest portions thereof, from a wear resistingmaterial so that the edge protectorsbecome integral parts of the skiproper, whereby the securing of said edges is relatively easy and fullyreliable. v

If the interconnecting layers are provided with plates extending overthe entire width of the ski,

such plates will have a relatively short length. due to the fact thatthe ski shall have a thickness which decreases from the middle part ofthe ski towards the ends thereof, and since the said plates are soshort, they will not be able to impart any warping to the bottom layer.Finally, if desired, all the layers of the ski may consist of railsglued together in the lateral direction of the ski, so that no solid,uninterrupted layer occurs, which extends through the entire width ofthe ski, thus all tensions are eliminated which might cause warping.

The invention is by way of example illustrated in the annexed drawing inwhich:

Figure 1 shows a cross section of a ski according to the invention,

Figure 2 shows a similar section of a modified embodiment,

Figure 3 is a still further sectional vlewillustrating anothermodification of the invention.

As illustrated in the drawing the bottom layer is composed of rails-Iglued together in the lateral direction of the ski, and the runnningface formed is provided with one or more steering grooves 2, as usual.The rails I may have any suitable cross sectional shape and may be ofequal or difierent widths. The two outer rails I, or the lower portionsthereof, may be formed from a wear resisting material, so that theyconstitute edge protectors forming integral parts of the skiconstruction proper and thus are reliably secured. The outer rail I may,at its lower part, be provided with an extension or flange l", whichextends into the adjacent rail, as illustrated to the right in Figure 1,in order to increase the security. 3 designates the top layer, whichserves to strengthen the interconnection between the rails of the bottomlayer and simultaneously forms, at least partially, the top of the ski.

As illustrated in Figure 2 the ski may consist of two layers which areeach composed of rails glued together in the lateral direction of theski.

The rails 3' of the top layer, which serves as connecting layer, arethen so shaped and the layers are so arranged in relation to each other,that the division lines between the'rails 3' of the top layer are not inalignment with the division lines between the rails l of the bottomlayer.

In skis constructed in this manner no solid layer occurs, which extendsover the entire width of the ski, and which could cause warping of theski, and at the same time the rails of the two layers are reliablyinterconnected.

As will be understood the ski may also be made up of more than twolayers. Thus, as illustrated in Figure 3, a third layer 4, is placedover the layer 3 and the layer 4 may be solid or may also be composed ofrails glued together in the lateral direction of the ski.

I claim:

1. A ski having a bottom layer of appreciable thickness consisting ofrails glued together in the lateral direction of the ski and at leastone top layer.

2. A ski having a bottom layer of appreciable thickness consisting ofrails glued together in the lateral direction of the ski and a top layerconsisting of rails glued together in the lateral direction, the twolayers being so situated in relation to each other, that the divisionlines between the rails of bottom layer are not in alignment with thedivision lines between the rails of the top layer.

3. A ski according to claim 1, in which the outer rails of the bottomlayer consist of a wear resisting material.

4. A ski according to claim 1, in which the lower parts of the outerrails of the bottom layer consist of a wear resisting material.

5. Aski comprising two superposed layers composed of rails gluedtogether in the lateral direction of the ski, and a third solid layersecured to the top of the uppermost one of said two superposed layers,one of said superposed layers providing a bottom for the ski and havingappreciable thickness.

BJQRN ULIEVOIDSAE'I'ER.

